c# - 如何在aspx中从父页面初始化子ascx控件的值？

Question

我有一个 aspx 文件Report.aspx

<%@ Register Src="~/ReportControls/AverageCostUtilization/AverageCostUtilizationSummaryReport.ascx" TagName="AverageCostUtilizationSummary" TagPrefix="CustomReportControls"%>

<div id="divAverageCostUtilizationDetailed"  runat="server" class="row d-flex justify-content-center" style="border:1px solid #00AEC0; width:114%; margin:10px;  border-radius:23px;">
            <CustomReportControls:AverageCostUtilizationDetailed Id="rprtAverageCostUtilizationDetailed" runat="server"/>
</div>

子班是AverageCostUtilizationDetailed.ascx

<table>
     <td Id="InpatientAvgUtilizationPlan1"></td>
</table>

现在，当 TheReport.aspx被加载时

public partial class CompareReports : System.Web.UI.Page
    {
      protected void Page_Load(object sender, EventArgs e)
      {
        if(condition)
        {
                InpatientAvgUtilizationPlan1.innerHtml = "First Condition";
        }
        else
        {
                InpatientAvgUtilizationPlan1.innerHtml = "Second Condition";
        }
      }
   }

但是在将值分配到这些表中时出现编译器错误。错误是

The name 'InpatientAvgUtilizationPlan1' dose not exist in the correct context

如何从其父类设置子类的此值

子类的 ascx.cs 代码是

 public partial class AverageCostUtilizationSummaryReport : System.Web.UI.UserControl
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
    }